Here is the code structure
dbfuncs.php : is the file which contains classes and functions for firing queries on mysql and pgsql
mysqlinsert.php : creates and fires inserts on mysql
mysqlselect.php : creates and fires selects on mysql
pgsqlinsert.php : creates and fires inserts on pgsql
pgsqlselect.php : creates and fires selects on pgsql
benchmark.php : script used to control concurrency and
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